Carson is the editor of two large books on the subject of the New Perspective (Justification and Variegated Nomism), which provide responses to the claims of Sanders, Dunn et al. I don’t have the time to read these at the moment, so the lectures are useful as a way of getting a summary of his viewpoint as well as a chance to hear his response to some of the NP criticisms of those books.
Lecture 1 gives a fairly succinct overview of the NP, while the other 2 lectures are used to provide a basic response. Carson does acknowledge that he has much respect for N T Wright, but particularly lays into his making the exile theme the controlling paradigm for his theology. Also, as a bonus, Lecture 3 includes the story of how Douglas Moo got his name!